Barrage Of Radiance

You beseech your deity and lash out with an aggressively graceful gesture, creating a barrage of radiant energy that travels in a straight line in a direction of your choosing. Each target caught in its path must make a Dexterity or Constitution saving throw (caster's choice). Allies are unaffected. 

On a success, the targets take half damage. On a fail, the targets take full damage and are blinded until the end of your next turn. As long as you maintain concentration, you can spend a bonus action to fire the barrage again. If the targets previously succeeded their saving throws, they make their next one with advantage. 

Undead have disadvantage on their saving throws against this spell regardless.